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DllLoader.cpp

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#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <tchar.h>

#include <stdio.h>

#include <malloc.h>

#include "../../MemoryModule.h"

typedef int (*addNumberProc)(int, int);

#define DLL_FILE TEXT("..\\SampleDLL\\SampleDLL.dll")

void LoadFromFile(void)

{

addNumberProc addNumber;

HRSRC resourceInfo;

DWORD resourceSize;

LPVOID resourceData;

TCHAR buffer[100];

HINSTANCE handle = LoadLibrary(DLL_FILE);

if (handle == NULL)

return;

addNumber = (addNumberProc)GetProcAddress(handle, "addNumbers");

_tprintf(_T("From file: %d\n"), addNumber(1, 2));

resourceInfo = FindResource(handle, MAKEINTRESOURCE(VS_VERSION_INFO), RT_VERSION);

_tprintf(_T("FindResource returned 0x%p\n"), resourceInfo);

resourceSize = SizeofResource(handle, resourceInfo);

resourceData = LoadResource(handle, resourceInfo);

_tprintf(_T("Resource data: %ld bytes at 0x%p\n"), resourceSize, resourceData);

LoadString(handle, 1, buffer, sizeof(buffer));

_tprintf(_T("String1: %s\n"), buffer);

LoadString(handle, 20, buffer, sizeof(buffer));

_tprintf(_T("String2: %s\n"), buffer);

FreeLibrary(handle);

}

void LoadFromMemory(void)

{

FILE *fp;

unsigned char *data=NULL;

size_t size;

HMEMORYMODULE handle;

addNumberProc addNumber;

HMEMORYRSRC resourceInfo;

DWORD resourceSize;

LPVOID resourceData;

TCHAR buffer[100];

fp = _tfopen(DLL_FILE, _T("rb"));

if (fp == NULL)

{

_tprintf(_T("Can't open DLL file \"%s\"."), DLL_FILE);

goto exit;

}

fseek(fp, 0, SEEK_END);

size = ftell(fp);

data = (unsigned char *)malloc(size);

fseek(fp, 0, SEEK_SET);

fread(data, 1, size, fp);

fclose(fp);

handle = MemoryLoadLibrary(data);

if (handle == NULL)

{

_tprintf(_T("Can't load library from memory.\n"));

goto exit;

}

addNumber = (addNumberProc)MemoryGetProcAddress(handle, "addNumbers");

_tprintf(_T("From memory: %d\n"), addNumber(1, 2));

resourceInfo = MemoryFindResource(handle, MAKEINTRESOURCE(VS_VERSION_INFO), RT_VERSION);

_tprintf(_T("MemoryFindResource returned 0x%p\n"), resourceInfo);

resourceSize = MemorySizeofResource(handle, resourceInfo);

resourceData = MemoryLoadResource(handle, resourceInfo);

_tprintf(_T("Memory resource data: %ld bytes at 0x%p\n"), resourceSize, resourceData);

MemoryLoadString(handle, 1, buffer, sizeof(buffer));

_tprintf(_T("String1: %s\n"), buffer);

MemoryLoadString(handle, 20, buffer, sizeof(buffer));

_tprintf(_T("String2: %s\n"), buffer);

MemoryFreeLibrary(handle);

exit:

if (data)

free(data);

}

int main(int argc, char* argv[])

{

LoadFromFile();

printf("\n\n");

LoadFromMemory();

return 0;

}